Use spacing to make clear where one factor (and its exponent) ends and the next begins. Without the parentheses, it will look like you mean "two cubed, times x", or 2 3 x, when you actually mean the variable to be in the exponent.
Without the parentheses, it will look like you mean " x squared, divided by three", or (x^2)/3.
If you have a graphing calculator, this is the same character as your calculator uses for powers. The carat key, usually "shift-6" on the keyboard, is customarily used to indicate exponents. Use different grouping symbols to demark the two fractions within the complex fraction. Without the parentheses, it would not be clear that the first " x" belongs inside the numerator, or that the " 5 x + 6" belongs inside the denominator. The parentheses make it clear that the "five" is included in the denominator. The variable isn't often in the denominator like this, so use parentheses to make it clear where the variable belongs. Some will assume that you meant 1/(2x)+5 or even 1/(2x+5) Without the parentheses around the "one-half", it will be unclear whether or not the variable is meant to be included in the denominator. The asterisk is commonly used to indicate multiplication, but you can insert the "times" sign (on a PC) by holding down the "ALT" key and typing "0215" on the numeric keypad. The "slash" is commonly used to indicate division or fractions, but you can also insert the "divided by" sign (on a PC) by holding down the "ALT" key and typing "0247" on the numeric keypad.
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